The Army is designing a new lethal hand grenade that can switched from fragmentation to a concussion grenade. Called the “enhanced tactical multipurpose hand grenade,” it will fill a capability gap from 1975, when the MK3A2 concussion grenade was taken out of service due to an asbestos hazard, according to an Army news release.

Benjamin Franklin nailed it when he said, "Fatigue is the best pillow." True story, Benny. There's nothing like pushing your body so far past exhaustion that you'd willingly, even longingly, take a nap on a concrete slab.